Index: /trunk/include/VBox/vmm/vm.h
===================================================================
--- /trunk/include/VBox/vmm/vm.h	(revision 55033)
+++ /trunk/include/VBox/vmm/vm.h	(revision 55034)
@@ -371,4 +371,6 @@
 /** PDM critical section unlocking is pending, process promptly upon return to R3. */
 #define VMCPU_FF_PDM_CRITSECT               RT_BIT_32(5)
+/** This action forces the VCPU out of the halted state. */
+#define VMCPU_FF_UNHALT                     RT_BIT_32(6)
 /** This action forces the VM to service pending requests from other
  * thread or requests which must be executed in another context. */
@@ -429,5 +431,6 @@
 /** Externally forced VMCPU actions. Used to quit the idle/wait loop. */
 #define VMCPU_FF_EXTERNAL_HALTED_MASK           (  VMCPU_FF_INTERRUPT_APIC | VMCPU_FF_INTERRUPT_PIC | VMCPU_FF_REQUEST \
-                                                 | VMCPU_FF_INTERRUPT_NMI  | VMCPU_FF_INTERRUPT_SMI | VMCPU_FF_TIMER)
+                                                 | VMCPU_FF_INTERRUPT_NMI  | VMCPU_FF_INTERRUPT_SMI | VMCPU_FF_UNHALT \
+                                                 | VMCPU_FF_TIMER)
 
 /** High priority VM pre-execution actions. */
@@ -466,5 +469,5 @@
                                                  | VM_FF_EMT_RENDEZVOUS)
 /** Normal priority VMCPU actions. */
-#define VMCPU_FF_NORMAL_PRIORITY_MASK           (VMCPU_FF_REQUEST)
+#define VMCPU_FF_NORMAL_PRIORITY_MASK           (VMCPU_FF_REQUEST | VMCPU_FF_UNHALT)
 
 /** Flags to clear before resuming guest execution. */
Index: /trunk/src/VBox/VMM/VMMR3/EM.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/EM.cpp	(revision 55033)
+++ /trunk/src/VBox/VMM/VMMR3/EM.cpp	(revision 55034)
@@ -1855,6 +1855,19 @@
         }
 
+        /*
+         * Forced unhalting of EMT.
+         */
+        if (VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_UNHALT))
+        {
+            VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_UNHALT);
+            if (rc == VINF_EM_HALT)
+            {
+                rc2 = VINF_EM_RESCHEDULE;
+                UPDATE_RC();
+            }
+        }
+
         /* check that we got them all  */
-        Assert(!(VMCPU_FF_NORMAL_PRIORITY_MASK & ~(VMCPU_FF_REQUEST)));
+        Assert(!(VMCPU_FF_NORMAL_PRIORITY_MASK & ~(VMCPU_FF_REQUEST | VMCPU_FF_UNHALT)));
     }
 
@@ -2551,5 +2564,5 @@
                         if (   rc == VINF_SUCCESS
                             && VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_INTERRUPT_APIC | VMCPU_FF_INTERRUPT_PIC
-                                                        | VMCPU_FF_INTERRUPT_NMI  | VMCPU_FF_INTERRUPT_SMI))
+                                                        | VMCPU_FF_INTERRUPT_NMI  | VMCPU_FF_INTERRUPT_SMI | VMCPU_FF_UNHALT))
                         {
                             Log(("EMR3ExecuteVM: Triggering reschedule on pending IRQ after MWAIT\n"));
@@ -2561,7 +2574,7 @@
                         rc = VMR3WaitHalted(pVM, pVCpu, !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF));
                         if (   rc == VINF_SUCCESS
-                            && VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_INTERRUPT_NMI | VMCPU_FF_INTERRUPT_SMI))
+                            && VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_INTERRUPT_NMI | VMCPU_FF_INTERRUPT_SMI | VMCPU_FF_UNHALT))
                         {
-                            Log(("EMR3ExecuteVM: Triggering reschedule on pending NMI/SMI after HLT\n"));
+                            Log(("EMR3ExecuteVM: Triggering reschedule on pending NMI/SMI/UNHALT after HLT\n"));
                             rc = VINF_EM_RESCHEDULE;
                         }
Index: /trunk/src/VBox/VMM/VMMR3/VMM.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/VMM.cpp	(revision 55033)
+++ /trunk/src/VBox/VMM/VMMR3/VMM.cpp	(revision 55034)
@@ -2411,4 +2411,5 @@
         PRINT_FLAG(VMCPU_FF_,INTERRUPT_SMI);
         PRINT_FLAG(VMCPU_FF_,PDM_CRITSECT);
+        PRINT_FLAG(VMCPU_FF_,UNHALT);
         PRINT_FLAG(VMCPU_FF_,REQUEST);
         PRINT_FLAG(VMCPU_FF_,HM_UPDATE_CR3);